Transfer mechanism for structural members

ABSTRACT

An improved mass production assembly line is provided for fabricating building walls and similar structural members in molds by applying a hardenable polyester film to the cavity surfaces of mold halves, joining the mold halves and then introducing a mixture into the mold cavity to form a polyurethane foam. First and second rectangular fields of rollers, each mounted on a pedestal, are adapted to carry respective mating halves of each mold in a horziontal plane from a start end of the fields to the terminating end. The mold cavities face upwardly. The lower surface of each mold half has secured thereto elongated T-shaped bars. The bars are parallel with each other, and each bar is adapted to be carried by one line of rollers in a respective one of the fields. The parallel axes of the rollers are set to an exact height by means of a laser light source and photoresponsive means so that the upper edges of the rollers lie in the same horizontal plane. The bars of each mold half have flat smooth lower edges lying in the same plane so that they support the large (e.g., 12 feet X 20 feet), thin-walled molds with minimum distortion. Minimum force is required of the workers for manually moving each mold along the field length or stopping it at work stations positioned along the field. A transfer mechanism at the terminating end of the fields receives each pair of mold halves on horizontal arms thereof. The arms include rows of rollers for receiving and supporting the T-shaped bars and are pivotally mounted at their adjacent edges. The transfer mechanism moves the mold halves to a position adjacent the fields; and the arms are pivoted to juxtaposed vertical positions to bring the mold halves together. The mold halves are secured to each other; and in this vertical position they are carried on an additional row of rollers on the transfer mechanism. The joined mold halves are manually moved over the latter rollers from the transfer mechanism to a row of supporting rollers on the floor of a foaming station. Rollers mounted on vertical axes in opposed vertical planes on either side of the floor roller support the mold halves for easy manual movement without falling over. Foam is applied to the cavity in the mold halves via an opening in the upper surface thereof. After the cavity is filled the mold halves are moved along the assembly line to a subsequent station where the mold halves are separated to removed the fabricated wall. An overhead crane is preferably used to pick up the mold halves at the foaming station and move them to the mold separation station.

United States Patent 11 1 Bourdo i 1 TRANSFER MECHANISM FOR STRUCTURAL MEMBERS [75] Inventor: John Lorin Bourdo. Phoenix. Ariz.

{73] Assignee: Automated Construction Industries.

Inc.. Phoenix. Ariz.

22 Filed; Feb. 25.1974

[21] Appl.No.:445,249

[561 References Cited UNITED STATES PATENTS 3,233,285 2/1966 Ludwig 425/453 X 3,434,528 3/1969 McGceney 164/339 3.543.335 12/1970 Meyer 425/454 X 3,604,497 9/1971 Sylvester 164/137 X 3.630.8l9 12/1971 Conger 264/45 X 3,659,986 5/1972 Ge1hman..... 425/454 X 3,734,671 5/1973 Talasz 425/450 X Primary Examiner-R. Spencer Annear Assistant Examiner-Mark Rosenbaum Attorney, Agent, or FirmRonald J. Clark [5 7] ABSTRACT An improved mass production assembly line is provided for fabricating building walls and similar structural members in molds by applying a hardenable polyester film to the cavity surfaces of mold halves, joining the mold halves and then introducing a mixture into the mold cavity to form a polyurethane foam.

First and second rectangular fields of rollers. each mounted on a pedestal, are adapted to carry respective mating halves of each mold in a horziontal 12 f: ml

1 1 June 17, 1975 plane from a start end of the fields to the terminating end. The mold cavities face upwardly. The lower surface of each mold half has secured thereto elongated T-shaped bars. The bars are parallel with each other, and each bar is adapted to be carried by one line of rollers in a respective one of the fields. The parallel axes of the rollers are set to an exact height by means of a laser light source and photoresponsive means so that the upper edges of the rollers lie in the same horizontal plane. The bars of each mold half have flat smooth lower edges lying in the same plane so that they support the large (e.g.. 12 feet X 20 feet), thin-walled molds with minimum distortion. Minimum force is required of the workers for manually moving each mold along the field length or stopping it at work stations positioned along the field. A transfer mechanism at the terminating end of the fields receives each pair of mold halves on horizontal arms thereof. The arms include rows of rollers for receiving and supporting the T-shaped bars and are pivotally mounted at their adjacent edges. The transfer mechanism moves the mold halves to a position adjacent the fields; and the arms are pivoted to juxtaposed vertical positions to bring the mold halves together. The mold halves are secured to each other; and in this vertical position they are carried on an additional row of rollers on the transfer mechanism. The joined mold halves are manually moved over the latter rollers from the transfer mechanism to a row of supporting rollers on the floor of a foaming station. Rollers mounted on vertical axes in opposed vertical planes on either side of the floor roller support the mold halves for easy manual movement without falling over. Foam is applied to the cavity in the mold halves via an opening in the upper surface thereof. After the cavity is filled the mold halves are moved along the assembly line to a subsequent station where the mold halves are separated to removed the fabricated wall. An overhead crane is preferably used to pick up the mold halves at the foaming station and move them to the mold separation station.

10 Claims, 9 Drawing Figures PATENTEIJJUN 17 I975 (3.890.075

IL-l

TRANSFER MECHANISM FOR STRUCTURAL MEMBERS CROSS REFERENCE TO RELATED APPLICATION The present application shows and describes structure which is claimed in a co-pending application. filed ofeven date herewith by the assignee of the present application and entitled Mass Production Line for Fabricating Structural Building Members.

BACKGROUND OF THE INVENTION This invention relates to the production line fabrication of housing components such as walls. roofs and the like from polymers and foamed materials.

In the production of housing, more efficient produc tion techniques have replaced to some extent the ageold method of construction at the site from individual boards. stones and other parts. However. modern plastic materials and other polymers and similar materials are not widely used as building materials. and the fabrication of walls. floors, roofs and similar elements from such materials is not satisfactorily efficient under prior techniques and results in deficiencies in the products.

Foamed plastic internal structures. such as of polyurethane foam, are recognized as desirable to provide excellent thermal insulation and satisfactory strength to the element at moderate cost.

These components are fabricated in large. unwieldy molds which must be handled without jarring or defor mation. The present invention is directed specifically to a transfer mechanism for receiving mating mold halves, pivoting the mold halves from horizontal to vertical positions for connecting to each other. and for discharging the connected mold halves.

SUMMARY OF THE INVENTION The improved transfer mechanism includes a supporting frame carried on a pair of parallel tracks. The tracks are positioned on the floor transverse to the direction of the field length. The frame has secured thereto a plurality of spaced metal wheels having V- shaped grooves around their circumference. The upper edges of the tracks have inverted V-shaped crosssections for receiving the mating wheels. A manually operable hydraulic motor rotates a rubber-tired wheel which is rotatably mounted on the frame and held against the floor by spring tension. thereby to move the frame along the tracks in either direction.

A pair of arms are pivotally mounted on parallel horizontal axes adjacent each other near the center of the frame. Pairs of opposed telescoping hydraulic cylinder and ram assemblies are pivotally secured to the frame and to each arm. one pair at each arm end adjacent the arm pivot axis. A first assembly of each pair is secured to the frame on one side of the arm pivot axis; and the second assembly of each pair is secured to the frame below the arm pivot axis.

A manually controllable hydraulic pump delivers a drive fluid to move the assemblies between their retracted and extended conditions. When the first and second assemblies of each pair are in their retracted and extended conditions respectively. the arms are held in a horizontal plane. The first assemblies are moved to their extended conditions in unison to move the arms to their vertical positions. at which point the second assemblies (now in their retracted condition) resist further movement of the arms. When the first assemblies are retracted and the second assemblies are extended. the arms are moved to their horizontal positions. The cylinders thus control the movement of the arms between horizontal positions and juxtaposed vertical positions.

A pair of conveyors is carried on the upper surface of each arm for receiving the mold halves from the assembly line field of rollers. After the mold halves are received on the conveyors. the transfer mechanism is moved on the tracks from its position adjacent the field of rollers to a position adjacent the foaming station. The arms are moved by their cylinders and ram assemblies to their vertical positions. carrying the mold halves between them. A central conveyor carried by the frame receives and supports the mold halves in their vertical positions. The mold halves are secured to each other to form a cavity therein and are moved from the central conveyor to a conveyor on the floor of the foaming station. The arms are returned to their horizontal positions in preparation for receiving the next mold halves from the roller fields.

These and other objects. features. characteristics and advantages will be apparent by consideration of the following description of a preferred embodiment of the invention, as illustrated by the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. la and lb are illustrations of a production line incorporating the improved transfer mechanism of the present application and FIG. 1 shows the arrangement of FIGS. la and lb;

FIGS. 2, 3 and 4 are fragmentary front and side elevation views and a plan view of the improved transfer mechanism;

FIGS. 5 and 6 are enlarged front and side fragmentary elevation views of a roller in the field of rollers and the pedestal supporting the roller; and

FIG. 7 is an enlarged side elevation view of the rubber-tired wheel and its actuating support mechanisms.

DESCRIPTION OF THE PREFERRED EMBODIMENT A co-pending application Ser. No. 445,087, filed Feb. 25, 1974, entitled Fabrication of Structural Members," and assigned to the same assignee of the present application describes and claims an improved process of fabricating building members such as walls. The improved apparatus of the present application is preferably used to implement said process in an efficient manner.

Briefly, said process requires an assembly line 1 (FIGS. la, lb) through which mating mold frame halves 2a and 2b are moved more or less continously from one station to another by operators. The mold halves 2a and 2b are initially positioned with their cavities facing upwardly to permit inserts such as 3 to be placed therein for forming windows and doors. As will be seen below, the lower or outer sides of the mold halves are carried by rows of pedestals 4 having rollers 5 rotatably carried at the upper ends thereof to form a mold conveyor system 6.

After the molds have received the inserts. they are sprayed or otherwise coated with a thin layer of wax at a wax application station 10 at one end of the conveyor system 6. The mold halves 2a and 2b are then moved to spray stations Ila and 11b at which applicators (not shown) are moved back and forth over the mold halves El apply a thin layer of a hardenable polyester material which preferably also contains fire-resistant filler. sucl. as hydrate of alumina. Enclosed internal elements {not shown). such as electrical boxes. electrical conduits. and water pipes are rested on the horizontal cavity surfaces of the mold halves 2a and 2b as the mold halves 2a and 2b are manually moved from the stations Ila and Ilb to stations 12a and 1217. In the stations 12a and 12b. a second thin layer of hardenable material is applied over the mold cavities and the internal elements therein. This second layer preferably includes chopped glass fiber as a filler in a hardenable polyester resin. The mold halves 2a and 2b are moved slowly and continuously to the right-hand end of the conveyor system 6.

An improved transfer mechanism is positioned adjacent to the end of the conveyor system 6 to receive the mating mold halves 2a and 2b on a pair of horizontally positioned swing frame assemblies 210 and 2Ib. The swing frame assemblies 21a. 21b are pivoted from their horizontal positions to their vertical positions to bring the mating mold halves 2a and 2b into engagement with each other in an upright position between the swing frame assemblies 21a and 2112. In this upright position, the mating mold halves 2a and 2b are clamped together to form a central cavity therein between the two polyester skins which have been formed therein.

The transfer mechanism 20 is carried on a pair of rails 22 preferably which run in a direction transverse to the conveyor system 6. Prior to pivoting of the swing frame assemblies 210 and 21b to their vertical positions, the transfer mechanism 20 is moved along the rails 22 to a position adjacent a foaming station 25. The foaming station 25 includes two juxtaposed planes of vertically disposed rollers, such as plane 26, adapted to receive therebetween the mold halves 2a and 2b, which have been latched together. An additional row of rollers 27 disposed at the bottom of the foaming station 25 support the lower edge of the mating molds 2a and 2b as they are moved between the roller planes 26. In the preferred embodiment, the foaming station 25 also includes a curing oven which can be comprised of electrical heating elements (not shown). The oven applies a temperature environment of 150 F to promote the further curing of the polyester resin skins. This preheating of the mold halves 2a and 2b to an elevated temperature improves the resulting bond between the foam and the polyester skins as described more fully in the above-identified co-pending application.

In the foaming station 25 the foaming material is transferred from containers 30 into the cavity of the mold halves 2a and 2b by way of pipes or hoses 31 through two or more open ports (not shown) in the top edge of the mold halves. The preferred material is one which reacts exothermically while in the molds to produce a foamed polyurethane. Injection of the material is preferably by a machine controlled froth or pour method of a pre-measured amount for the particular mold. The operator need only note the mold type and punch a selected button to dispense the proper amount. Injection is at not more than 50 pounds per minute per port to prevent splashing.

Since the mold halves are carried in upright positions at the foaming station. the material drops between the coated cavity walls. The automatic foaming reaction proceeds, the foamed product rises to the top and a sur plus portion thereof may expand out through the open ports and is subsequently trimmed away.

The foam rises freely to form a foam solid of final weight density of 2.4 to 2.5 pounds per square foot. The reaction is self-initiating and self-sustaining and is exothermic. Temperatures within the mold halves 2a and 2!) rise to about 300 F. The reaction is fully completed in about 25 minutes while internal pressure rises to 15 pounds per square inch in 5 to 8 minutes and drops to 0 pounds per square inch within the 25 minutes.

The planes of rollers. such as 26, are positioned suffeiently close to each other both vertically and horizontally so that they provide support to the enlarged surfaces of the mold halves 2a and 2b when they are subjeeted to the 15 pounds per square inch pressure. Thus, they provide the dual function of preventing bursting of the mold halves 2a and 2b as well as providing relatively frictionless movement of these enlarged mold halves 2a and 2b in vertical positions through the foaming station 25. The mold halves 2a and 2b are held between the roller planes. such as 26, for 30 to 35 minutes to assure that complete curing has occurred before the roller support is removed. In the event that it is desired to move the mold halves 2a and 2b from the foaming station as soon as possible to make room for a second set of mold halves, the planes of rollers 26 can be extended toward the left with respect to FIGS. la and lb as far as is required.

Adjacent the conveyor system 6, the mold halves 2a and 2b may then be picked up by an overhead crane assembly (not shown) and transported to a station (not shown) in which the mold halves 2a and 2b are separated from each other, and the finished wall is removed. This latter station is preferably in the vicinity of the wax application station 10 so that the mold halves 2a and 2b can be cleaned and reused on the assembly line I in a rather continuous fashion. The improved transfer mechanism 20 will now be described in greater detail, reference being directed to FIGS. 2, 3 and 4. As described above, the transfer mechanism 20 comprises a pair of swing frame assemblies 21a and 21b. The swing frame assemblies are pivotedly mounted on hinge pins a, 40b, 41a and 41b carried by pillow blocks 42a, 42b, 43a and 43b respectively. The swing frame assembly 21a comprises a pair of arms 44 and 45 (FIG. 3), each of which is similar and each of which is carried on a respective coaxial hinge pin 40a and 40b, which in turn are carried by the pillow blocks 42a and 42b. The swing arm 44 comprises a spaced pair of triangular members 46 and 47, preferably having tubular steel elements which are rectangular in cross section. The tubular steel elements of the member 47 are welded to each other at their ends and are provided added strength by intermediate elements 48a and 48b. The intermediate elements 480 and 48b are also comprised of tubular steel welded at the ends thereof to the triangular member 47. The spaced triangular members 46 and 47 are secured together by means of a plate 49 welded to the outer extremity of the members and by mounting plates 50a and 50b which are welded to the inner edges of the members 46, 47 as shown in its vertical position in FIG. 2. As seen in FIGS. 3 and 4, similar plates such as 500 are elongated rectangular plates welded to the swing arm 45. The member 46 of the swing arm 44 is identical in construction to the member 47 and will not. therefore, be described in further detail.

The swing arm 45 is identical in construction to the swing arm 44 and will not, therefore. be described in further detail. Swing frame assembly 2 lb includes similar arms 54, 55 (FIG. 4).

As indicated above, the swing frame assemblies 21a and 21b are pivotedly carried by the hinge pins such as 41a, 41b, 40a, and 40b for movement from the vertical solid line positions shown in FIG. 2 to the horizontal positions shown by broken line in FIG. 2. FIG. 4 shows the swing frame assembly 21b in its horizontal position and assembly 21a in its vertical position. The means for controlling the movement of the swing frame assembly 21b between these horizontal and vertical positions will now be described in detail.

A first telescoping hydraulic ram and cylinder assembly 60a is pivotally carried by a hinge pin 61 and trunnion 62 on the main frame 39 of the transfer mechanism 20. The opposite end of the assembly 60a is pivotedly connected to the swing frame assembly 21b by means including pivot pins such as pin 63 and pillow blocks such as block 64 (FIG. 2). When the ram and cylinder assembly 60a is hydraulically actuated to its extended position shown in solid line in FIG. 2, it moves the swing frame assembly 21b to the vertical position. When the assembly is in its retracted position illustrated by broken line in FIG. 2, the swing frame assembly 21b is moved to its horizontal position.

A second ram and cylinder assembly 650 is pivotally carried on the main frame 39 by a pivot pin 66 and a trunnion 67. The opposite end of the assembly 65a is pivotally connected to the swing frame assembly 21b by means of a hinge pin 68 and a pillow block 69. In its extended and retracted positions respectively. the assembly 65a maintains the swing frame assembly 21b in its horizontal and vertical positions respectively.

When the ram and cylinder assembly 60a is hydraulically actuated to move the swing frame assembly 21b from its horizontal to its vertical position. the ram and cylinder assembly 65a is hydraulically controlled to retract causing the swing frame assembly to move more steadily. When the swing frame assembly 21b reaches the vertical position shown in FIG. 2, the ram and cylinder assembly 650 resists further counterclockwise movement of the swing frame assembly 21b and maintains the assembly steady in its vertical position.

Similar pairs of ram and cylinder assemblies 60b, 65b, 60c, 65c, 60d, 65d are provided for each of the two swing arms of 44, 45, 54 and 55 of each of the swing frame assemblies 21a and 21b. They are identically connected to their respective swing arms and will not be further described in detail. the swing frame assemblies 21a and 21b are mirror images of each other, they are fabricated in the same way, and are hydraulically actuated between their horizontal and vertical positions in the same way. A description of the details of both swing frame assemblies 2Ia and 21b will, therefore. not be made.

Each of the plates 50a and 50b have conveyor assemblies 70 and 71 secured thereto. The conveyor assembly 70 comprises a pair of elongated U-shaped members 72 and 73 secured to the plates 50a and 500. Pivot pins such as pin 74 are secured between and carried by the members 72 and 73 on spaced parallel axes. Each of the pins such as 74 carries rotatable rollers such as roller 75. The rollers 75 support the mold halves as they are received on the transfer mechanism 20.

The conveyor assembly 7] is similar to the conveyor assembly 70 and will not be described in detail. Similar conveyor assemblies 76 and 77 are carried by arms 54 and 55 of the swing frame assembly 21b as seen in FIG. 4.

An additional conveyor assembly 80 similar in construction to the conveyor assembly 70 is carried by the main frame 39 between the swing frame assemblies 21a and 21b. When the mold halves 2a and 2b are raised by the swing frame assemblies 21a and 21b to their vertical positions as shown in FIG. 2, then each ofthe mold halves come to rest on the conveyor assembly 80. Shoulders, such as shoulders 81, on swing frame assembly 21b support the mold halves as the mold halves are raised toward their vertical positions until such time as the lower edges of the mold halves engage the upper edges of the rollers 82 of the conveyor assembly 80.

In the preferred embodiment. the mold halves such as 2a (FIG. 2) have three T-shaped members 78a. 78b and 780 received in channels 79a, 79b and 790 extending the entire length of the mold half. The members 78a, 78b and 781" are rigid steel rails which prevent de formation of the mold half 2a and which ride with little friction over the rollers 5 of field 6 (FIGS. la, lb) and over the roller assemblies 76, 77. Since the lower surface of the mold 2a should be perfectly level the members 78a, 78b, 78c have extensions 78d, 78e, 78f welded thereto to provide leveling of the mold half as it rides on rollers 5. The members 78a. 78b. 78c also prevent the mold surface from bowing outwardly when the molds are vertically disposed, particularly in the foaming station where internal pressures are expected.

The main frame 39 is carried by four wheels 84, 85, 86 and 87 rotatably mounted on the main frame 39. The wheels mate with and ride on the upper surfaces of the tracks 22.

The transfer mechanism 20 is moved between the various positions described with respect to FIGS. la and lb by means of a drive mechanism 90, including a rubber-tired wheel 91 rotated in the direction desired by means including a hydraulic motor 92. This drive mechanism will be described in greater detail below with respect to FIG. 7. A hydraulic pump and actuating electric motor (not shown) in an oil tank 93 (FIG. 3) supply the drive fluid to the hydraulic motor 92. The pump and motor are in turn controlled by manually actuated control means 94. The oil tank 93 and the con trol means 94 are carried in an operator station on the transfer mechanism 20.

The operator station is secured to the main frame 39 in any well-known manner and is supported intermediate the ends thereof by a wheel 95 and further includes a platform 96 for the operator. The operator station also includes as a part thereof adjustable mold stop assemblies 97 which align the edges of the mating mold halves so that they will be properly positioned for connection in their vertical positions.

FIG. 7 illustrates the drive mechanism 90 in greater detail. The hydraulic motor 92 drives the tire 91 by way of a sprocket 100, a roller chain 101, a lower sprocket 102, and a reduction gear mechanism 103, preferably with 30 to l ratio. The drive mechanism 90 is pivotally secured to a cross member 39a of the main frame 39. The pivotal connection comprises horizontal and vertical bars 104 and 105 welded to each other and welded to the housing of the hydraulic motor 92 and the reduction gear mechanism 103. A rectangular plate 106 welded to the lower end of the bar receives a pivot pin [07 therethrough. An L-shaped bracket assembly 108 also receives the pivot pin 107 and cotter pins such as 109 retain the pin 107 in the plate 106 and the bracket assembly 108. The bracket assembly 108 is rigidly secured to the cross member 39a by means of a pair of bolt and nut assemblies 110 and III.

A counterclockwise spring assembly 112 urges the tire 91 around pin 107 and against the floor 113. The assembly 112 includes an adjustable screw llS received through a threaded opening in an L-shaped member 116 rigidly secured to the frame 39. The opposite end of the screw is received through an opcning in the upper end of the member 105 and a set screw 117 secures the screw 116 in the bar 105. A washer 118 and a nut 119 control the compression in a spring 120 received on the screw 115 between the member 116 and washer 118.

FIGS. 5 and 6 show the pedestal 4 and roller 5 in greater detail together with a preferred means for coupling the two to each other. A rectangular plate is welded to the upper end of the pedestal 5. Pairs of screws 131a. 131b and l32u l32b are welded to the upper surface of the plate 130. A generally U-shaped bracket 133 is carried on the screws 1310, 131b, 132a and 132b by means of nuts 134a, 134b, 135a, 135i: 136a. 136b (not shown) 1370 and 13711 (not shown). The upper free ends of the bracket 133 carry a pivot pin 140 upon which the roller 5 is rotatably received.

As indicated earlier, the upper edge of the roller 5 is carefully adjusted to be perfectly horizontal and to be at an accurately determined height above the floor sur face. This is achieved by using a laser source of coherent light and conventional electronic scanning means to ajust when the rollers are first installed. Tightening of the nuts 134a. 134b, 1350. 135b, 1360, [36b and 1370 137b maintains the roller 5 in the adjusted position.

Various changes and modifications of the preferred embodiment of the invention described will be apparent to those of ordinary skill in the art; and it is intended that such changes and modifications are covered by the appended claims.

What is claimed is:

1. A transfer mechanism for joining and transporting mating mold halves in which building walls are formed comprising:

a main supporting frame;

a pair of swing frame assemblies;

means pivotally connecting adjacent ends of assemblies to the main frame for movement of the assemblies about respective axes between central parallel vertical positions facing each other and horizontal positions outwardly from the axes of the pivotal means;

first hydraulically controlled telescoping cylinder and ram means for each assembly pivotally mounted on the main frame below the respective pivotal axis of the assembly and pivotally connected to the respective assembly;

second hydraulically controlled telescoping cylinder and ram means for each assembly pivotally connected to the main frame and pivotally connected to the respective assembly outwardly of the assembly axes;

means including a pump for controlling the first and second cylinder and ram means to move the respcctive assemblies between said vertical and horizontal positions;

a pair of elongated conveyors carried by each frame assembly in spaced relation parallel to each other and to the pivotal axes of the frame assemblies;

said conveyors pairs adapted in said horizontal positions of the assemblies to receive mating mold halves and further adapted in said vertical positions of the frame assemblies to hold the mating mold halves against each other for securing the halves together;

shoulder means on each frame assembly adapted to engage and support the respective inner mold half end as the mold half is raised from the horizontal to vertical positions with the assembly, and

an additional conveyor carried by the main frame intermediate and parallel with the pivotal axes of the assemblies and adapted to engage and support the mold halves above said shoulder means as the assemblies approach their vertical positions.

2. The transfer mechanism of claim 1 further comprising:

wheels carried by the main frame on axes parallel with the pivotal axes of the assemblies and adapted to support the main frame for movement on floormounted rails transverse to said wheel axes, and

means. including a pneumatic-tired drive wheel carried by the main frame and adapted to engage the floor below the mechanism, for moving the transfer mechanism back and forth along the rails.

3. A transfer mechanism for joining and transporting pairs of mating structure mold halves having dimensions as large as in the order of l2 by 20 feet said mechanism comprising:

a main frame;

a pair of swing frames pivotally carried by the main frame on adjacent parallel axes and adapted in horizontal positions thereof to receive respective ones of said mold half pairs and adapted in vertical positions thereof to hold the mating mold halves in engagement with each other between the swing frames to permit clamping of the mold halves together:

means connected to the main frame and to the swing frames for moving the swing frames between said horizontal and vertical positions, and

conveyor means carried by the main frame between the swing frames for supporting the mating mold halves when the swing frames are in their vertical positions.

4. The transfer mechanism of claim 3 further comprising:

wheels mounted on the main frame adapted to support the main frame for movement along rails, and

means including a pneumatic-tired drive wheel adapted to move the main frame along the rails.

5. The transfer mechanism of claim 4 wherein the main frame moving means further comprises:

mounting means rotably carrying the pneumatic tired drive wheel;

spring means connected to the main frame and to the mounting means and urging the drive wheel into engagement with the floor;

a hydraulic motor carried by the mounting means.

and

means providing a drive coupling between the motor and the drive wheel.

6. The transfer mechanism of claim 3 adapted to join and transport mold halves having T-shapcd bars secured thereto to inhibit warping of the mold halves. said mechanism further comprising:

rows of parallel rollers carried by each swing frame,

each row adapted to receive thereon one of the T- shaped bars. whereby the mold halves can be manually moved onto the swing frames with minimum friction and with minimum distortion of the mold halves.

7. The transfer mechanism of claim 6 wherein the rows of rollers engage the T-shapecl bars in the vertical positions of the swing frames and force the pair of mold halves into engagement with each other so that they can be secured together.

8. The transfer mechanism of claim 7 further comprising:

manually adustable stops carried by each swing frame adapted to engage and position sides of the pair of mold halves to align them for subsequent connection to each other.

9. The transfer mechanism of claim 3 wherein the swing frame moving means comprises:

first hydraulically controlled telescoping cylinder and ram means pivotally connected to the main frame and to one of the swing frames;

second hydraulically controlled telescoping cylinder and ram means pivotally connected to the main frame and to the other swing frame, and

means selectively supplying hydraulic actuating fluid to the first and second cylinder and ram means for moving the swing frames between their vertical and horizontal positions.

10. The transfer mechanism of claim 3 wherein the swing frame moving means comprises:

a first pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame below the pivotal axis of one of said swing frames and each pivotally connected to the one swing frame;

a second pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame outwardly from said pivotal axis and each pivotally connected to the one swing frame;

a third pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame below the pivotal axis of the other swing frame and each pivotally connected to the other swing frame;

a fourth pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame outwardly from the pivotal axis of the other swing frame and each pivotally connected to the other swing frame, and

means selectively supplying hydraulic actuating fluid to the cylinder and ram assemblies for moving the swing frames between their vertical and horizontal positions. 

1. A transfer mechanism for joining and transporting mating mold halves in which building walls are formed comprising: a main supporting frame; a pair of swing frame assemblies; means pivotally connecting adjacent ends of assemblies to the main frame for movement of the assemblies about respective axes between central parallel vertical positions facing each other and horizontal positions outwardly from the axes of the pivotal means; first hydraulically controlled telescoping cylinder and ram means for each assembly pivotally mounted on the main frame below the respective pivotal axis of the assembly and pivotally connected to the respective assembly; second hydraulically controlled telescoping cylinder and ram means for each assembly pivotally connected to the main frame and pivOtally connected to the respective assembly outwardly of the assembly axes; means including a pump for controlling the first and second cylinder and ram means to move the respective assemblies between said vertical and horizontal positions; a pair of elongated conveyors carried by each frame assembly in spaced relation parallel to each other and to the pivotal axes of the frame assemblies; said conveyors pairs adapted in said horizontal positions of the assemblies to receive mating mold halves and further adapted in said vertical positions of the frame assemblies to hold the mating mold halves against each other for securing the halves together; shoulder means on each frame assembly adapted to engage and support the respective inner mold half end as the mold half is raised from the horizontal to vertical positions with the assembly, and an additional conveyor carried by the main frame intermediate and parallel with the pivotal axes of the assemblies and adapted to engage and support the mold halves above said shoulder means as the assemblies approach their vertical positions.
 2. The transfer mechanism of claim 1 further comprising: wheels carried by the main frame on axes parallel with the pivotal axes of the assemblies and adapted to support the main frame for movement on floor-mounted rails transverse to said wheel axes, and means, including a pneumatic-tired drive wheel carried by the main frame and adapted to engage the floor below the mechanism, for moving the transfer mechanism back and forth along the rails.
 3. A transfer mechanism for joining and transporting pairs of mating structure mold halves having dimensions as large as in the order of 12 by 20 feet, said mechanism comprising: a main frame; a pair of swing frames pivotally carried by the main frame on adjacent parallel axes and adapted in horizontal positions thereof to receive respective ones of said mold half pairs and adapted in vertical positions thereof to hold the mating mold halves in engagement with each other between the swing frames to permit clamping of the mold halves together; means connected to the main frame and to the swing frames for moving the swing frames between said horizontal and vertical positions, and conveyor means carried by the main frame between the swing frames for supporting the mating mold halves when the swing frames are in their vertical positions.
 4. The transfer mechanism of claim 3 further comprising: wheels mounted on the main frame adapted to support the main frame for movement along rails, and means including a pneumatic-tired drive wheel adapted to move the main frame along the rails.
 5. The transfer mechanism of claim 4 wherein the main frame moving means further comprises: mounting means rotably carrying the pneumatic tired drive wheel; spring means connected to the main frame and to the mounting means and urging the drive wheel into engagement with the floor; a hydraulic motor carried by the mounting means, and means providing a drive coupling between the motor and the drive wheel.
 6. The transfer mechanism of claim 3 adapted to join and transport mold halves having T-shaped bars secured thereto to inhibit warping of the mold halves, said mechanism further comprising: rows of parallel rollers carried by each swing frame, each row adapted to receive thereon one of the T-shaped bars, whereby the mold halves can be manually moved onto the swing frames with minimum friction and with minimum distortion of the mold halves.
 7. The transfer mechanism of claim 6 wherein the rows of rollers engage the T-shaped bars in the vertical positions of the swing frames and force the pair of mold halves into engagement with each other so that they can be secured together.
 8. The transfer mechanism of claim 7 further comprising: manually adustable stops carried by each swing frame adapted to engage and position sides of the pair of mold halves to aligN them for subsequent connection to each other.
 9. The transfer mechanism of claim 3 wherein the swing frame moving means comprises: first hydraulically controlled telescoping cylinder and ram means pivotally connected to the main frame and to one of the swing frames; second hydraulically controlled telescoping cylinder and ram means pivotally connected to the main frame and to the other swing frame, and means selectively supplying hydraulic actuating fluid to the first and second cylinder and ram means for moving the swing frames between their vertical and horizontal positions.
 10. The transfer mechanism of claim 3 wherein the swing frame moving means comprises: a first pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame below the pivotal axis of one of said swing frames and each pivotally connected to the one swing frame; a second pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame outwardly from said pivotal axis and each pivotally connected to the one swing frame; a third pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame below the pivotal axis of the other swing frame and each pivotally connected to the other swing frame; a fourth pair of hydraulically controlled telescoping cylinder and ram assemblies, each pivotally connected to the main frame outwardly from the pivotal axis of the other swing frame and each pivotally connected to the other swing frame, and means selectively supplying hydraulic actuating fluid to the cylinder and ram assemblies for moving the swing frames between their vertical and horizontal positions. 